KR100250069B1 - Camera driving method and surveillance device using thereof - Google Patents

Abstract

A method and apparatus for manually or automatically selecting and monitoring a plurality of cameras while reducing power consumption while reducing power consumption, wherein one of the plurality of cameras is selected for a predetermined time. In the automatic mode in which the monitor is connected to the monitor sequentially, when the image signals of the current sequence camera are connected, the power of the next sequence camera is connected, and the predetermined time has elapsed after connecting the image signals of the current sequence camera. After that, the video signal of the next sequence camera is connected, and when the user presses the step switch, in the manual mode of switching from the currently displayed camera to the next sequence camera and connecting to the monitor, it is assured that the step switch is pressed. When the next sequence number of power supply is connected to the camera, and then After time has elapsed, and to couple the video signal of the camera, and then turn the power supply and the video signal of the camera that is currently displayed at the same time as cutting off.

Description

Camera driving method of multi-channel monitoring device and monitoring device using same

The present invention relates to a method of driving a camera of a multi-channel monitoring device and a monitoring device using the same, and in particular, to monitor and select a plurality of cameras manually or automatically, while reducing the power consumption and shaking the screen when power is supplied to the camera. The present invention relates to a method of driving a camera of a multi-channel monitoring apparatus removed and a monitoring apparatus using the same.

Many closed circuit TVs are installed and used to monitor theft in places such as banks and department stores. However, the closed circuit TV system is expensive because it is expensive for the general public to install and use. Therefore, a low-cost multi-channel monitoring apparatus is provided, which allows a plurality of low-cost CCD cameras to be provided, which can be selected and displayed on one monitor.

However, in such a low-cost multi-channel monitoring apparatus, only one camera is displayed on the monitor at the same time, and therefore it is not necessary to operate all the cameras at the same time. However, it takes some time for the camera to display a normal screen after the power is turned on. If the camera is turned on only when necessary, the screen may flicker or flicker on the monitor for some time after the power is turned on. It was uncomfortable. In addition, in order to prevent such a phenomenon, there is a disadvantage in that a lot of power consumption is always turned on the camera.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and when the desired camera is automatically or manually selected from among a plurality of cameras and displayed on a monitor, the screen shake caused by the camera switching while reducing power consumption of the camera is reduced. It is an object of the present invention to provide a camera driving method of the removed multi-channel monitoring apparatus and a monitoring apparatus using the same.

1 is an overall schematic block diagram of a general multi-channel monitoring apparatus;

2 is a schematic block diagram of a monitor of the present invention;

3 is a schematic block diagram of an embodiment of an interface unit of a monitor of the present invention;

4 is a channel selection timing diagram in the automatic mode of the interface unit of the monitor of the present invention;

5 is a channel selection timing diagram in the manual mode of the interface unit of the monitor of the present invention.

Explanation of symbols on the main parts of the drawings

1 monitor 2 camera

10 Camera Interface Unit 11 Video Signal Amplifier

12 Brown tube 13 Surge protection circuit and constant voltage controller

14 Synchronous Separator 15 Horizontal Control Unit

16Vertical Control Unit 101 Control Unit

102 Mode selector switch 103 Amplifier

104 Video Output Terminal 105 Speaker

106 switch 107 switch (analog multiplexer)

108 Camera Connector

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is an overall schematic block diagram of a general multi-channel monitoring apparatus, FIG. 2 is a schematic block diagram of a monitor of the present invention, FIG. 3 is a schematic block diagram of an embodiment of an interface unit of a monitor of the present invention, and FIG. 4 is a monitor of the present invention. Fig. 5 is a channel selection timing diagram in the automatic mode of the interface unit of Fig. 5 is a channel selection timing diagram in the manual mode of the interface unit of the monitor of the present invention.

1 is a schematic block diagram of a general multi-channel monitoring apparatus. That is, in the general multi-channel monitoring apparatus, a plurality of cameras 2 are connected to one monitor 1, and one or more cameras 2 are automatically or manually selected and displayed on the screen by an operation on the monitor.

2 is a schematic block diagram of a monitor of the present invention. The monitor 1 displays a camera interface unit 10 for interfacing with a plurality of cameras 2 and an image signal from a specific camera 2 introduced through the camera interface unit 10 in the CRT 12. A video signal amplifier 11, a surge protection circuit and a constant voltage controller 13, a synchronous separator 14, a horizontal controller 15, a vertical controller 16, and the like, are provided. Other parts except for the camera interface part are the same as in the general TV display device, and thus a detailed description thereof will be omitted.

3 is a schematic block diagram of one embodiment of the camera interface unit 10 of the monitor of the present invention. The camera interface unit 10 of FIG. 3 is an embodiment when four channels, that is, four cameras are installed.

The camera interface unit 10 includes a camera connection terminal 108 for connecting a plurality of cameras, a switch 106 for selectively connecting power to a camera, and audio and video signals from a specific camera, respectively. 105) and a switch (analog multiplexer) 107 for connecting to the video output terminal 104, a mode selection switch 102 for selecting an automatic or manual mode, and a setting of the mode selection switch 102. Accordingly, the control unit 101 controls the switches 106, 107, and 107. In FIG. 3, the video output terminal 104 is connected to the image signal amplifier 11 of FIG. 2. On the other hand, the switch 106 for the power connection may use a switch having a current capacity that can withstand the power consumed by the camera, such as a mechanical relay or a solid-state relay.

First, the operation of the interface unit 10 when the mode selection switch 102 is selected as the automatic mode will be described with reference to FIG. 4. The automatic mode refers to a mode in which a plurality of cameras 2 are sequentially selected for a predetermined time, connected to the monitor 1, and displayed. In Figure 4 (a) shows the number of the camera to be operated for each time period when the horizontal axis is the time axis. (b-1) shows the connection state with the first camera in the switch 106 for power connection, and the high indicates that the power is connected. (b-2) shows the connection state with the first camera in the audio and video signal connection switch 107, and likewise, the high signal is connected. Similarly, (c-1) and (c-2) indicate the connection status of camera 2 with power and audio / video signals, and (d-1) and (d-2) indicate camera 3 with power and audio / video signals. (E-1) and (e-2) show the connection status of camera 4 with power and audio / video signals, respectively.

According to the conventional method, in the automatic mode, power is always connected to all the cameras 2, and only the audio and video signals from each camera are sequentially switched and displayed at regular intervals. On the other hand, in the present invention, as shown in Figure 4, when connecting the voice / image signal of the immediately preceding camera to connect the power of the next camera. That is, the power of the second camera, which is the next camera, is connected in advance at the timing t1 at which the image signal from the first camera is to be displayed (see (c-1) of FIG. 4). In this case, since the power is connected to the second camera at t1, which is much earlier than the operating time t2 of the second camera, the power is stabilized at t2 so that the shaking does not appear on the screen. Likewise, connect the power of camera 3 to t2, which is the operation point of camera 2 (see (d-1) in FIG. 4), so that the timing of power supply is connected to the other camera at the time of operation of the previous camera. By doing so, all cameras are displayed in sequence, but the power consumption is reduced and the screen shake is prevented. The reason why the power of the next camera is connected when the operation of the previous camera is switched is that the power of the next camera is connected when the previous camera is in operation. In addition, the reason why the power supply is connected when the camera before the previous camera is in operation is because the efficiency is low in terms of power saving.

Next, the power connection timing when the mode selection switch 102 is selected as the manual mode will be described with reference to FIG. In the manual mode, each time the user presses the step switch (not shown), the camera of the next channel is selected and the image from the camera is displayed on the monitor. In this case, if the user switches the power switch and the image switch simultaneously when the user presses the step switch, the screen shakes until the selected camera is warmed up. On the contrary, when the power is always supplied to the camera, power consumption increases. Therefore, in the present invention, as shown in FIG. 5, when it is detected that the step switch is pressed for a predetermined time or more, power is first supplied to the camera of the next channel, and a predetermined time Δτ elapses, and then the image and audio switch is recalled. The camera is connected to the next channel. Figure 5 (a) shows the state of pressing the step switch, (b-1) shows the power connection state of the camera 1, (b-2) shows the video / audio signal connection state of the camera 1 Similarly, (c-1) and (c-2) are camera 2, (d-1) and (d-2) are camera 3, and (e-1) and (e-2) are camera 4 It shows power connection status and video / audio signal connection status respectively.

First, if the step switch is pressed while the image from the first camera is being displayed ((b-1) and (b-2) in Fig. 5 is high), at a time t1 after the step switch is pressed, The control unit 101 assures that the step switch is pressed and connects the power of the next camera, that is, the second camera (rising edge of Fig. 5 (c-1)). Then, after a certain time Δτ has elapsed, the power of the first camera and the video / audio signal are disconnected (polling edges of FIGS. 5 (b-1) and (b-2)), and the video / audio signals of the second camera are simultaneously connected. (Rising edge of Fig. 5 (c-2)). That is, after confirming that the step switch is firmly pressed, the next camera power is connected, and after that time Δτ has elapsed, the next video / audio signal of the next camera is connected so that the screen shake does not occur on the display. . At this time, the predetermined time Δτ is determined to be the time without the shaking of the screen by the experiment, the shorter the shorter it is advantageous in terms of power saving may be determined in consideration of the advantage. According to the experiment of the present inventors, about 0.5 seconds to 1 second is appropriate, but since this is determined by the characteristics of the monitor and the camera and the switch used, it may be desirable to determine experimentally in consideration of the characteristics of the monitor and the camera and the circuit used. will be.

In addition, when the step switch is pressed, the power switch is not immediately connected, but only when the button is pressed for a predetermined time, the step switch is pressed. Therefore, it is possible to prevent accidental transfer to the next channel due to noise or the like. This is illustrated well in t4 of FIG. 5. That is, when the step switch is released at t4, when a predetermined time has not elapsed since the step switch is pressed, the control unit 101 does not recognize that the step switch is pressed and ignores it and does not switch to the next camera. . Therefore, even if a short period of spark signal is generated by the step switch due to noise or the like, the operation of the apparatus is not affected.

In the above description, although both the video signal and the audio signal are selected and connected, only the video signal may be connected without the audio signal.

As described above, according to the present invention, when the desired camera is automatically or manually selected from among a plurality of cameras and displayed on the monitor, the screen shake caused by the camera switching is eliminated while reducing the power consumption of the camera. The effect can be obtained.

Claims (4)

In the method of driving a camera of a multi-channel monitoring apparatus for automatically or manually selecting the video signal from a plurality of cameras to display on a single monitor, the method In the automatic mode in which one of the plurality of cameras is sequentially connected to the monitor for a predetermined time, when the image signal of the current turn camera is connected, the power of the next turn camera is connected, and the current turn Connecting the image signal of the next camera after the predetermined time has passed since the image signal of the camera was connected, When the user switches to the next sequence camera from the currently displayed camera every time the user presses the step switch and connects to the monitor, when the user is sure that the step switch is pressed, the power of the next sequence camera is connected, and then And after the time has elapsed, the video signal of the next sequence camera is connected at the same time as the power of the currently displayed camera is cut off and the video signal is connected. The method of claim 1, wherein the step switch is assured that the step switch is pressed when the step switch is kept pressed for a predetermined time after recognizing that the step switch is pressed. In the multi-channel monitoring device to display the video signal from a plurality of cameras automatically or manually selected on one monitor, A first switch capable of selectively connecting power to the plurality of cameras respectively, a second switch for selectively connecting video signals from one of the plurality of cameras to the video signal unit, an automatic mode and a manual mode And a control unit for controlling the first and second switches according to the setting of the mode selection switch. The control unit, When the mode selection switch is set to the automatic mode, the first switch is controlled to connect the power of the next turn camera when the picture signals of the current turn camera are connected, and the picture signal of the turn camera is connected. And controlling the second switch to connect the image signal of the next camera after a predetermined time elapses. When the mode selection switch is set to the manual mode, the first switch is controlled to connect the power of the next turn camera when the step switch is pressed, and after the predetermined time has elapsed, the current display is being displayed. And controlling the first and second switches to disconnect the power of the camera and the video signal and to connect the video signals of the next turn camera. The multi-channel monitoring apparatus according to claim 3, wherein the control unit is sure that the step switch is pressed when the step switch is kept pressed for a predetermined time after recognizing that the step switch is pressed.

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